the ilcta mdb horizontal test stand for srf cavities l.
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The ILCTA_MDB Horizontal Test Stand for SRF Cavities

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The ILCTA_MDB Horizontal Test Stand for SRF Cavities. Andy Hocker FNAL-TD AEM, 25-JUN-2007. Horizontal Testing --- Context. Fail!. Cavity Fabrication. Surface Processing. Vertical Testing. Fail!. Pass!. Horizontal Testing. Surface Processing. Cavity Dressing. Pass!.

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Presentation Transcript
horizontal testing context
Horizontal Testing --- Context


Cavity Fabrication

Surface Processing

Vertical Testing



Horizontal Testing

Surface Processing

Cavity Dressing


Cold String Assembly


mdb lay of the land
MDB: Lay of the Land

Horizontal test area for ILC

RF Hut

Vertical Test area for HINS


hts cave and rf hut
HTS Cave and RF Hut

WG switch

charging supply

300 kW klystron


RF waveguide (1.3 and 3.9 GHz)

LHe/LN2 feed can

Horizontal Test Cryostat (HTC)

High power pulsed RF system (operated w/ CC2 for > 1 yr)


typical hts test cycle
Typical HTS test cycle
  • Install cavity in HTC
  • Warm, off-resonance coupler conditioning (high pulsed power processing)
  • Cooldown to 1.8 K
  • On-resonance conditioning of coupler/cavity
  • Map out Q0 vs Eacc curve
  • Test new widgets, etc.
  • Warmup
  • Remove cavity
  • Goal: ~10 day turnaround

Geophones (ILC CM vibration R&D)


c22 prep dressing
C22 prep (“dressing”)

Cavity tuner installation

Installation of cold part of input coupler at CAF-MP9 clean room

Ready to install in HTC

Installation of warm part of input coupler


first measurement at hts
First measurement at HTS
  • Room-temperature measurement of fundamental passband modes
  • Zoom of “pi-mode” (accelerating mode)


status and plans
Status and plans
  • Struggling with cavity cooldown
    • Identified a leaky liquid level probe as culprit, repairing this week, go for cooldown again
  • Finishing up RF distribution/interlock checkout
    • Installing WG shutters to allow for multi-cave (HTS and CC2) configuration
    • Finishing up safety paperwork, final walk-through soon
  • After RF checkout, begin commissioning
    • Execute HTS test cycle (~1 month)
  • Declare open for business
    • First customer: FNAL third-harmonic (3.9 GHz) cavity for DESY’s FLASH facility
    • 1.3 GHz cavities for first US-built ILC CM as schedule allows